Multiattack. Narthus makes two attacks using Vile Mace or Fateful Bolt in any combination.
Vile Mace. Melee Attack Roll: +4, reach 5 ft. Hit:5 (1d6 + 2) Bludgeoning damage plus 3 (1d6) Necrotic damage.
Fateful Bolt. Ranged Attack Roll: +4, range 120 ft. Hit:8 (1d12 + 2) Necrotic damage, and the next attack roll made against the target before the end of Narthus's next turn has Advantage.
A craven lackey, Narthus serves Ivlis out of fear rather than loyalty. Narthus spends his days groveling before Ivlis and cruelly whipping new initiates to the Cult of Chaos into shape. Narthus's feral nature leads some cultists to speculate that he was raised by wild animals.